Bridge



(No Model.) 2 Sheets-Sheet I. G. L. STROBEL.

BRIDGE.

Patented June 6, 1 893.

f l iilllll p C4 0? 1 I (No Model.) 2 Sheets-Sheet 2. 0. L. STROBBL.

BRIDGE.

No. 498,993. Patented-June 6, 1893.

T no'roumuv WASHINGTON.

UNITED STATES PATENT ()EEICE.

CHARLES LOUIS STROBEL, OF CHICAGO, ILLINOIS.

BRIDGE.

SPECIFICATION forming part of Letters Patent No. 498,993, dated June 6, 1893.

Application filed April26, 1892.. Serial 110.430.7752. (No model.)

To aZZ whom, it may concern.-

Be it known that 1, CHARLES LoUIs STRO- BEL, of Chicago, Illinois, have invented a certain new and useful Improvement in Bridges, of which the following is a specification.

The object of my invention is to make a simple, efiicient and durable iron or steel bridge, of the kind usually called a through girder bridge with suspended fioor beams; and the invention consists in the features and combinations hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a broken plan view of one end of my improved bridge; Fig. 2 a cross sectional view taken on line 2 of Fig. 1; Fig. 3 a side elevation of the bridge; and Fig. 4: a cross sectional View, showing a modified form of bridge.

A are the girders composed of I-beams, a diagonal braces securing the lower beams together in pairs, and a I-beam separators between the upper pairs, B cross blocks extending between the upper pairs, B cross blocks extending over the tops of the I-beams when single beams are used; 0 cross ties or floor beams supporting the track, and c spikes preventing sidewise motion thereof; D vertical rods securing the cross ties O to the cross blocks B; and E longitudinal guard rails resting on the ties or girders and fastened thereto.

This invention is especially applicable to bridges in which the spans are so great as to rsatisfactory-it being difficult to re-place the :door beams, and the lower flanges of the girders being liable to be overloaded. The

form of bridge first mentioned is expensive, and requires a greater depth from base of rail to bottom of bridge than in many cases is ad- In both forms it is also necessary missible.

to do field riveting, which adds considerably to the expense of construction. The purpose of my invention is to obviate these objections. In my improved bridge, the wooden cross ties or floor beams are held in position by suspension, so that they can be easily removed, singly or otherwise, without destroying the track, whenever this becomes necessary because of decay or for other reasons. The wooden blocks B B can also be readily renewed whenever necessary without disturbing the track.

In Fig. I I have shown a modification inwhich single I-beams are used, these beams being of a depth sufficient to support the load, and thus render additional I-beams placed on top unnecessary. In this construction, the cross blocks B are placed on top of the I- beams, and the braces securing the girders together, are placed preferably near the top of the beams, the load being supported from the top.

Although I prefer to make the girders of I-beams, this is not in all cases necessary, as they may be formed of plates and angles built up into similar forms of construction.

As the essence of my invention consists in making a through bridge with single or compound beams, of a depth sufficient to support the load, it will of, course be understood that I do not intend to limit myself to minor featu res or details of construction. On the contrary, I intend to vary form and construction, and to omit parts or use equivalents, as circumstances may suggest or render expedient.

I am aware that it is old to suspend floor beams from trusses or girders of the skeleton type, in which the webs consist of separate members connecting the cords, with large open spaces between them, these trusses being used for long spans; but in my invention the girders are solid, there being no open spaces in the webs, and being economical, durable, and lacking in vibration are used for short spans.

I claim- 1. In a through bridge, solid girders of a depth sufficient to support the load, braced or secured together in pairs, with suspended blocks supported by the beams, and a floor floor beams substantially as described. suspended from the blocks, substantially as IO 2. In a through bridge, solid girders 0011- described. sisting of beams one above another riveted or w 5 bolted together, and braced together in pairs, CHARLES LOUIb STROBEL' substantially as described. WVitnesses:

3. In a through bridge, the combination EPHRAIM BANNING, of solid girders consisting of beams, cross SAMUEL E. HIBBEN. 

